WORK INSTRUCTION for Calibration of Pressure Guages

WORK INSTRUCTION INSTRUCTION FOR CALIBRATION OF PRESSURE GAUGES

Job Number

Document No 2

Q

A

W

I

N

M

FABRICATION DIVISION

Location:

E

0

1

3

00

Date

01.09.04

Prepared By

SP/PK

Quality Managemen Managementt

Reviewed By

SNS

Jamnagar

Approved By

AJV

RELIANCE INDUSTRIES LIMITED, JAMNAGAR

Department:

Revision Number

Hard copy of this procedure shall be treated as uncontrolled if not signed by approver

Time of Print: 3:46 PM PM

Fabrication Division RELIANCE INDUSTRIES LIMITED, JAMNAGAR

CONTENTS 1. INTRODUCTION 2. PURPOSE 3. SCOPE 4. ABBREVIATIONS & DEFINITIONS 5. RESPONSIBILITY AND AUTHORITY 6. REFERENCE 7. FLOW CHART 8. INSTRUCTIONS FOR CALIBRATION OF PRESSURE GAUGE 9. RECORDS

Work instruction for calibration of pressure gauges Document No. 2 QA WIN ME 013 Rev-00, Date:-01/09/2004

Page 2 of 7 Quality Management Department


1.

INTRODUCTION Calibrated pressure gauges are to be used for pressure testing to ensure the correctness of the applied pressure. The Calibration of pressure gauges is one of the critical process and need to be controlled to ensure the proper calibration of the gauges.

2.

PURPOSE The purpose of this work instruction is to provide step by step instruction for the calibration of Pressure Gauges.

3.

SCOPE The scope of this work instruction is limited to the calibration of pressure gauges with calibrated dead weight tester and used for the pressure testing of piping and equipments.

4.

5.

ABBREVIATIONS & DEFINITIONS QMD

Quality management department

HOD

Head of department.

DWT

Dead Weight Tester

P.G

Pressure Gauge

RIL

Reliance Industries Limited

RESPONSIBILITY & AUTHORITY QMD HOD is responsible for approval of this work instruction. QMD Lead, Fabrication Division is responsible for implementation and maintaining of this procedure.

6.

REFERENCE ASTM E1003 IS 3624




7.

FLOW CHART Request For pressure calibration

gauge Return to store/requestor

Verify the gauge for physical damage

Reject the gauge

Not ok

Ok Install the pressure gauge to be calibrated on DWT, Remove the g auge glass to check tension of pointer. Record readings 0%, 25%, 50%, 75%, 100% of the span in Pressure Gauge ‘Before Adjustment’

Not setting within two attempts

Check for Zero reading,

No

Is reading zero?

Adjust Pointer

Yes Apply Pressure 0%, 25%, 50%, 75%, and 100% o f the gauge reading

Adjust pointer in the deviation points

No

Whether reading is within 1% of Full Scale reading

Yes Decrease Pressure in the steps of 75%, 50%, 25%, and 0% of the gauge reading

No Whether reading is within 1% of

Yes, Gauge Calibrated/Adjusted for use

2QA FMT ME 050

Fix sticker on the gauge with tag no and calibration date.

Update data in the database




8.

INSTRUCTIONS FOR CALIBRATION OF PRESSURE GAUGE Following points are to be followed for calibration of pressure gauges, Step 1

Requester shall give request for calibration of pressure gauges to QMD Lead or his representative of Fabrication Division by filling through format No.2QA FMT ME 051 Rev.00. For fabrication division internal use, the request format need not be given. The detail will be entered in the register. Step 2

Check the gauge for any physical damages. In case of any physical damage, reject the gauge and return to requester/store as applicable. Step 3

Then connect the pressure gauge on dead weight tester for calibration & remove the glass of gauge to check the tension of the pointer. Step 4

Note the readings @ 0%, 25%, 50%, 75%, 100% of the full scale reading and record the reading in format No. 2QAFMT ME 050. Step 5

If the deviation at the interval is within 1% of the full scale reading, start reducing the pressure and note the reading @ 75%, 50%, 25%, and 0%, of the full scale reading and record the reading in format No. 2QAFMT ME 050. Step 6

If the deviation at the interval is within 1% of the full-scale reading, the gauge can be certified as calibrated. Put calibration sticker with tag no., calibration date and validity in case of outside gauges. For fabrication division gauges only put the printer paper with calibration date and tag no., validity need not be mentioned. Step 7

Enter the detail in the database for future use. Deviation

In case the deviation in the reading of step 5 and/or step 6 exceeds 1% of the full-scale reading, try to adjust the needle at the deviation points and repeat the step 5 and step 6 after adjustment. After adjustment, if the readings of step 5 and step 6 come within the limit, the gauge can be certified as calibrated with the comment of adjusted and certified for use.




The adjustment trial shall not be repeated more than two times. If after second trial also, the reading deviation remains more than 1% of the full scale reading, the gauge shall be rejected.

9.

RECORDS For gauges other than Fabrication Division, Certified Calibration Report will be issued to the requestor along with the gauges. For gauges calibrated for Fabrication Division, Hard copies of Calibration Report will be maintained for one month. The following sticker shall be attached to each calibrated pressure gauge of Fabrication Division Fabrication Division Certified for use Pr. Gauge tag No._______________ Cal. Date _______________ Calibrated by _______________

Other than Fabrication Division, the following sticker will be fixed on the calibrated pressure gauges Fabrication Division Certified for use Pr. Gauge tag No._______________________ Cal. Date _______________________ Next Cal. Date Calibrated by

2 QA FMT ME 050 Rev. 00 2 QA FMT ME 051 Rev.00

_______________________ _______________________

Pressure Gauge Calibration Report Request Format for Pressure Gauge Calibration (to be maintained for one month)



WORK INSTRUCTION for Calibration of Pressure Guages

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